The bus, which was coming from Preston station, grounded on the empty plinth on Butler Street on Monday night.
Passer-by Paul van de Rooy said: “If you look carefully, the blue lights of the plinth are under the bus and it looks like the sub-frame is resting on the top.”
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A second double decker bus was later spotted trying to drag the bus off after it became wedged on the empty plinth where a bollard used to stand.
It is far from the first vehicle to fall foul of first the decorative bollards that stand in the Fishergate shared space scheme.
Indeed the bollards have been knocked over so often that the council appears to have given up on replacing them - leaving empty plinths which have ensnared other drivers.
Without the bollards, the plinths seem hard to spot, being low, grey and poorly lit, if lit at all.
The same is true at the other end of town, where a Church Street plinth which once housed a lamppost was struck over a year ago, and has been left bare since.
County Councillor Keith Iddon, Cabinet member for highways and transport, said: “These bollards are important safety features which highlight the crossing points and help to protect pedestrians as they cross the road.
“We do not pay for damage to vehicles which have hit the bollards or plinths.
“In fact we always attempt to reclaim the cost of any damage from drivers who have caused damage across the highway network, where we can identify the vehicle involved.
"If people have any information about this incident, please contact us.”